Head of Finance (#1) | Tier 1 VC-Backed B2B Marketplace | Remote-first (UK based preferred)

Head of Finance (AI-Native) | Tier 1 VC-Backed B2B Marketplace Start-up | Remote (UK Timezone)

The Client

Harmonic is proud to announce we have been retained to work with a B2B enterprise-grade marketplace transforming a large, fragmented legacy sector. Backed by Tier 1 VCs, having just raised a large Series A, the business has built strong commercial traction by replacing a slow, fragmented status quo with a modern, AI-native platform. Their distribution network already reaches a significant base of enterprise clients, and the commercial momentum is real.

The business is now gearing up for a large Series B. The founding team has rare domain credibility and an established network in their sector; this is a company at an inflection point where commercial momentum is running ahead of financial infrastructure, and this hire is the answer to that.

The Role

This is a first finance hire, reporting directly to the CEO. You will take ownership of existing outsourced US accounting, a financial modelling capability currently managed by an interim RevOps lead, and a UK transfer pricing arrangement, then build a scalable, AI-enabled finance function from the ground up.

The initial split is roughly 50% FinOps (monthly close, payments, reconciliations, controls), 30% FP&A (financial modelling, GMV analytics, projections, spend ROI), and 20% systems and controls as insourcing begins. You will also lead Series B preparation end-to-end: the investor-grade reporting, data room, and financial narrative. This role is hands‑on now and grows in strategic weight quickly. You will be the CEO's strategic financial partner.

Key Responsibilities

• Take ownership of outsourced accounting providers and transfer pricing arrangements; own the monthly close, controls, and cash management from day one
• Build FP&A from scratch: financial modelling, GMV analytics, spend ROI analysis, projections, and scenario planning
• Develop finance dashboards and KPIs that drive commercial and board-level decision-making
• Lead Series B preparation: investor-grade reporting, data room, and financial narrative
• Design and implement an AI-enabled finance function; use tooling and automation to build lean, real-time infrastructure rather than a large traditional team
• Partner closely with the CEO and leadership team as a trusted strategic voice on commercial decisions
• Manage relationships with outsourced payroll, tax, and statutory filing providers; own the roadmap to bring capability in-house
• Work effectively across US and UK time zones in an international operating environment
• Build the strategy for the future of the finance function, including hiring and mentoring.

Qualifications

• Experience as a first or early finance hire in a venture-backed business, with a track record of building financial infrastructure from scratch
• Strong background in FP&A and financial modelling; comfortable owning forecasting, scenario planning, and commercial analysis
• Technology fluency: comfortable with API integrations, using AI tools for reporting and automation, and building systems rather than just operating them
• Comfortable working across US and UK time zones
• Background in marketplace, ecommerce, or B2B SaaS; particularly where GMV-based or multi-sided payment models are relevant
• Experience supporting a fundraising process: investor reporting, data rooms, and financial narrative building
• At least a relevant accountancy qualification (ACA / ACCA / CIMA or equivalent) may be beneficial, though is not required
• Experience building or managing outsourced finance provider relationships

Location

Remote‑first with occasional meet‑ups in London.

At Harmonic, we are dedicated to fostering an inclusive and equitable workplace. We actively welcome applications from individuals of all backgrounds and assure you that every candidate will be thoughtfully considered for the roles we represent, without regard to race, religion, gender expression, disability, or sexual orientation.

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